Service difficulty report · Lug · Boeing 737924ER

Difficulty date
April 14, 2025
Submitted
April 15, 2025
Operation
Air carrier
Aircraft
N37437
Make and model
Boeing 737924ER
Aircraft serial
33532
Aircraft time
49,687 hours, 17,641 cycles
Part
Lug
Condition
Corroded
Location
Zone 200
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

RH MID PLUG DOOR FWD AND AFT BONDING STRAP LUGS AND HARDWARE ARE CORRODED AT WEB ATTACH POINTSREMOVED CORROSION AS PER SRM 53-60-15-1A-2 PARAGRAPH 4.D.3 REWORKED AREA REQUIRES THICKNESS CHECK. INSPECTED THE FWD AND AFT BLEND-OUTS PER NDT/NTM 00-04/ PART-4-00-04-02 ULTRASONIC INSPECTION OF THIN MATERIALS WITH OLYMPUS 35, THE THINNEST PART OF THE FWD BLEND-OUT IS 0.055 INCH AND THE THINNEST PART OF THE AFT BLEND-OUT IS 0.056 INCH. ACP GRID MAP THICKNESS MEASUREMENTS OF FWD AND AFT REPAIR AREAS REF NTM PART 4-00-04-02 . THINNEST MATERIAL WAS 0.052 INCH AT FWD REPAIR AREA AND 0.056 INCH AT AFT REPAIR AREA. GRID MAP MEASUREMENT PICTURES ATTACHED. AFTER EVALUATION FOUND ALLOWABLE DAMAGE OF 10%, MATERIAL THICKNESS IS 0.063'', ON THE AFT SIDE DEEPEST POINT IS 0.056'' WHICH IS 11.2%. ON THE FWD SIDE DEEPEST POINT IS 0.052'' WHICH IS 18%. FOUND TO BE OUT OF LIMITS AS PER SRM 53-60-15-1A-2 PARAGRAPH 4.D.(3) FIGURE 103. PART REQUIRES REPLACE. REMOVED FWD SEAL RETAINER REF SRM 51-40-02. REMOVED CENTER SEAL RETAINER REF SRM 51-40-02. REMOVED DAMAGED WEB ASSY REF SRM 51-40-02. CLEANED AREA AND PREPARED HOLES FOR HFEC. REF SRM 51-10-02-0G-0 PARAGRAPH 11. MATERIAL ID FOR WEB 7075 T6. THICKNESS 0.063" REF DWG 146A8702-1 MATERIAL ID FOR WEB 7075 T6. THICKNESS 0.063" PO: 1566166. REF DWG 146A8702-1 COMPLETED HFEC PER SRM 51019002-0G-0 PAR. 11 TO ZERO TIME THE HOLES, PER HFEC ROTARY HOLE PER NDT 6-51-00-00 P16 AND COUIINSTALLED NEW WEB AND COMPLETED ESFR